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White House aide John McEntee steps off Marine One at the White House, Sunday, March 19, 2017, in Washington. President Donald Trump, who is returning from a trip to his Mar-a-Lago estate in Palm Beach, Fla.

President Donald Trump's personal aide is leaving the White House and will rejoin his campaign, but sources told NBC News reported he is under investigation by the Secret Service for serious financial crimes.

Two federal law enforcement officials told NBC News that John McEntee, served as the president's personal assistant, was under investigation. One said his security clearance had been "in limbo for some time."

A source had told CNN that McEntee is under investigation by the Departmet of Homeland Security for serious financial crimes unrelated to the president.

Trump's 2020 Republican campaign announced Tuesday morning — before reporting that McEntee is under investigation — that he will serve as a senior adviser for campaign operations, calling him and another new hire, 2016 campaign spokeswoman Katrina Pierson, "proven leaders."

WH: Cannot Guarantee Trump Didn't Use N-Word

The White House defended President Donald Trump calling former protégée Omarosa Manigault-Newman a "dog" in a Tuesday press conference. Press secretary Sarah Huckabee Sanders also could not guarantee that Trump has never used the N-word on record, but doubled down in his defense.

(Published 2 hours ago)

McEntee was one of a shrinking group of campaign aides still working in the turbulent West Wing.

Trump's White House has seen a rash of exits recently. Trump announced Tuesday that he had ousted Secretary of State Rex Tillerson. Trump's top economic adviser Gary Cohn left recently amid internal debate over Trump's plans for tariffs.

Politico reported in December that McEntee, a former University of Connecticut quarterback, would chat with Trump about football and family.